21 #ifndef __JackDummyDriver__    22 #define __JackDummyDriver__    24 #include "JackTimedDriver.h"    46             JackDriver::CycleTakeBeginTime();
    48             if (JackAudioDriver::Process() < 0) {
 
Locked Engine, access to methods is serialized using a mutex. 
Inter process synchronization using POSIX semaphore.